Some Don'ts in Google Adsense

My revenue drops in Google Adsense. Not much. From US$ 30/month to US$ 9/month. Thank God I have a job and many side jobs. Otherwise I cannot support my family.

One thing that bugs me is I earn US$ 30 where my web's traffic is very little. After getting more and more visitos, how come the revenue is down? Not up? The RPM down from 1.35 (1 US$ for 1000 pageviews) into 0.2 only. 

Well, some violations I did is:

How Come Google Adsense Earning Become So Low?

I used to earn about US$ 30 per month Google Adsense. It's around US$ 1 a day. Not much but it's OK. I estimate for 1,000 page views I get 1 dollar.
But recently my revenue is lower and lower. It could get US$ 8 / month. Less than 1/3 as before.
And today only US$ 0.06 only with  698 page views.  My calculation I get at least US$ 0.6 for 698 page views. How come it's only US$ 0.06 only? Only US$ 1 for 10,000 page views.